package com.sky.aop;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    /**
     * 切入点
     */
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}
    /**
     * 通知 自动填充公共字段
     */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        //获得方法签名对象、
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        //获得方法上的注解
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);
        //获得注解中的操作类型
        OperationType operationType = autoFill.value();

        //获取当前目标方法的参数
        Object[] args = joinPoint.getArgs();

        if (args == null || args.length == 0){
            return;
        }
        //实体对象
        Object entry = args[0];
        //准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();
        if (operationType == OperationType.INSERT){
            Method setCreateTime = entry.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
            Method setUpdateTime = entry.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setCreateUser = entry.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateUser = entry.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            //通过反射调用目标对象方法
            setCreateTime.invoke(entry,now);
            setUpdateTime.invoke(entry,now);
            setCreateUser.invoke(entry,currentId);
            setUpdateUser.invoke(entry,currentId);
        }else if (operationType == OperationType.UPDATE){
            Method setUpdateTime = entry.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
            Method setUpdateUser = entry.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(entry,now);
            setUpdateUser.invoke(entry,currentId);
        }
    }

}
